GH-37408: [C++] Install arrow-compute.pc only when ARROW_COMPUTE=ON #37409
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Rationale for this change
GH-34295 changed meaning of
ARROW_COMPUTE
.ARROW_COMPUTE=ON
means that "all compute kerenels are enabled" not "compute module is enabled".arrow-compute.pc
is for detectingARROW_COMPUTE
. Soarrow-compute.pc
should be installed only whenARROW_COMPUTE=ON
.What changes are included in this PR?
Add missing
if (ARROW_COMPUTE)
.Are these changes tested?
Yes.
Are there any user-facing changes?
Yes.